Writing instrument



FIG. 1 is a perspective view of a writing instrument showing my new design.

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a cross-section taken along line 7-7 of FIG. 6; and,

FIG. 8 is a cross-section taken along line 8-8 of FIG. 6.

The broken lines illustrate portions of the writing instrument that form no part of the claimed design. 

CLAIM The ornamental design for a writing instrument, as shown and described. 